Overhead door closer

Abstract

An overhead door closer comprising including a housing, an output shaft with a cam disc, which shaft is rotatably movable supported in the housing, a link-plate carriage with two rotatably movable pressure rollers supported in the link-plate carriage, wherein the pressure rollers roll on the cam disc, a piston which is linearly guided in the housing, a piston rod which with one end is connected to the link-plate carriage, and with the other end is connected to the piston, and a closer spring, which, on the side of the piston facing the link-plate carriage, abuts at the piston.

1 . An overhead door closer, comprising a housing,
 an output shaft with a cam disc, which shaft is rotatably movable supported in the housing,   a link-plate carriage with two pressure rollers which are rotatably movable supported in the link-plate carriage, wherein the pressure rollers roll on the cam disc,   a piston which is linearly guided in the housing,   a piston rod, which is connected to the link-plate carriage with one end and is connected to the piston with the other end, and   a closer spring, which, at the side of the piston facing the link-plate carriage, abuts at the piston.   
     
     
         2 . The overhead door closer according to  claim 1 , wherein the housing comprises an opening and a cover closing the opening, wherein the output shaft is supported in the cover, and wherein the link-plate carriage can be inserted into the housing via said opening. 
     
     
         3 . The overhead door closer according to  claim 1 , herein a distance of the output shaft to the center of the piston and a width of the cam disc, wherein the distance is from 5 times to 10 times the width. 
     
     
         4 . The overhead door closer according to  claim 1 , wherein the housing consists of materials which are suitable for the injection molding process. 
     
     
         5 . The overhead door closer according  claim 4 , wherein a guiding surface for the piston inside the housing is formed by means of an inserted metal bushing or by means of inserted metal strips. 
     
     
         6 . The overhead door closer according to  claim 1 , wherein the link-plate carriage does not get in contact with the housing and is simply guided via the two pressure rollers and the piston rod. 
     
     
         7 . The overhead door closer according to  claim 1 , wherein the closer spring abuts at a shoulder in the housing, wherein the shoulder is positioned between the output shaft and the piston. 
     
     
         8 . The overhead door closer according to  claim 1 , wherein the piston rod is rotatably movable connected to the piston. 
     
     
         9 . The overhead door closer according to  claim 1 , wherein the space in the housing, from the link-plate carriage to the piston, is freely continuous and is in particular not interrupted by separating walls. 
     
     
         10 . The overhead door closer according to  claim 1 , wherein the link-plate carriage is integrally manufactured with the piston rod or is rigidly connected to the piston rod. 
     
     
         11 . The overhead door closer according to  claim 1 , wherein the link-plate carriage comprises at least one carrying element on which both pressure rollers are supported and in that the carrying element is integrally manufactured with the piston rod. 
     
     
         12 . The overhead door closer according to  claim 1 , wherein the link-plate carriage is screwed to the piston rod. 
     
     
         13 . The overhead door closer according to  claim 12 , wherein the axis of the screw connection between the link-plate carriage and the piston rod is disposed vertically or parallel with regard to the output shaft. 
     
     
         14 . A door closer arrangement, comprising an overhead door closer according to  claim 1 , a lever, and a sliding rail, wherein one end of the lever is connected to the output shaft and the other end of the lever is linearly movable guided in the sliding rail.